The United Nations Navy (UNN) is the naval branch of the military of the United Nations. It is considered less technologically advanced than its Martian counterpart, the Martian Congressional Republic Navy, but has the largest fleet in Sol system and is overall superior.

The UNN is commanded by the Admirals, which, in turn, are the subordinates of the Secretary-General.

In 16 XTE, the United Nations Navy was absorbed into the Consolidated Fleet, which, in turn, waged war against the Free Navy during the Interplanetary War.

Fleets Edit

Designation Commanding Admiral Appearances Notes
Third Fleet Admiral Souther TV Fleet Admiral Nguyễn relieved Souther of command before attempted mutiny

Ships Edit

Designation Class Ship type Appearances Notes
UNN Agatha King Truman Class Dreadnought / Battleship Books/TV UNN Jupiter Fleet Flagship taken over by Admiral Nguyễn and sent to Jovian moon Io.
UNN Okimbo Truman Class Dreadnought / Battleship Books UN Jupiter Fleet Flagship carrying Admiral Souther over Jovian moon Io
UNN Thomas Prince Xerxes Class (Books) Truman Class (TV) Dreadnought / Battleship Books/TV Carried various religious clergy and artists into the Ring.
UNN Nathan Hale unknown battleship class Battleship
TV Sent by the UN to arrest Fred Johnson on Tycho Station. Raced the MCRN Scirocco to Phoebe until the MCRN Scirocco destroyed the station.
UNN Seung Un unknown class Destroyer(Books) / Fleet Support Ship(TV) Books/TV Sabotaged outside The Ring in plot to discredit James Holden
UNN Munroe Munroe Class Light Destroyer Books Admiral Nguyễn sent six destroyers of this class to eliminate the Rocinante;More however, Chrisjen Avasarala warns Holden and offers herself as protective cover if he will come to her[2]
UNN Wu Tsao unknown frigate class Frigate Books Part of fleet Admiral Nguyễn had sent to Ganymede but which Avasarala disbanded
UNN Ravi Phantom Class Corvette Books
UNN Dagmar Unknown Class Unknown Books
UNN Macedon Unknown Class Unknown Books
UNN Darius Unknown Class Unknown Books
UNN Greenville Unknown Class Unknown Books
UNN Tanaka Unknown Class Unknown Books
UNN Dyson Unknown Class Unknown Books
UNN Kennedy Unknown Class Unknown Books
UNN Zhang Fei (Books)
Zheng Fei (TV)[3]
Unknown Class Unknown Books and TV James Holden had been posted aboard this vessel when he was discharged
UNN Triton Unknown Class Unknown Books
UNN Jimenez Unknown Class PT Boat[4] TV Destroyed by the UNN Agatha King for betraying the orders of Fleet Admiral Nguyễn.
UNN Heisserer Unknown Class PT Boat[4] TV Refused to acknowledge Admiral Nguyễn and moved away from the Third Fleet before Jimenez's destruction
UNN Battle Angel Unkown Class Unknown TV Present at Io engagement
UNN Halpenny Unknown Class Unknown TV Present at Io engagement
UNN Hodson Unknown Class Unknown TV Present at Io engagement
UNN S.A. Corey Unknown Class Unknown TV Present at Io engagement
UNN The Victor Unknown Class Unknown TV Present at Io engagement
UNN Campsi Unknown Class Unknown TV Present at Io engagement
UNN Mograph Unknown Class Unknown TV Present at Io engagement
UNS Arboghastcivilian research vessel Unknown Books and TV Commandeered by the UNN to investigate the Eros crash site on Venus.

History Edit

Eros Incident Edit

When the Donnager is destroyed by what is believed to be OPA ships, and Mars declares war on the Belt, the the UN stays neutral. Later when Holden released information on the ships that destroyed the Donnager were actually made on Earth, UNN ships fired on Martian Congressional Republic Navy ships in Mars' orbit and destroyed the Deimos deep radar station. After securing Martian space, the UNN begin laying siege to Mars, forcing, the MCRN then orders nearly all their ships in the system to return to Mars and declares war on Earth. The Belt claims it a victory, and the siege lasts for months. However, all combat remains in orbit and doesn't spread onto Martian soil.

The Charles Lyell, a science vessel, escorted by the Ravi, was doing a non-Belt asteroid mapping when it was diverted to Eros to collect samples of the Protomolecule. It was in a confrontation with the Rocinante until they finally worked together to stop the asteroid.

Ganymede IncidentEdit

In the eighteen months since the Eros incident the MCR and UN have been in a bitter cold war.

The Ganymede incident was an event where a human-protomolecule hybrid attacked Martian and UN Marines on Ganymede, killing everyone except Gunnery Sergeant Roberta Draper. The initial attack was misinterpreted by both the MCR and the UN as an attack from the other side, which lead to a battle above and on Ganymede that claimed nearly three thousand military and civilian lives, as well as over five billion MCR dollars of infrastructure damage.

Post Interplanetary WarEdit

At the end of the war only three of the UNN's Battleships are still operational, two of which are deployed to the Slow Zone to guard the Laconia system gate.


  1. Called a UNN Battleship by Admiral Souther. S1E08.
  2. The Expanse: {{CW, Ch. 39 & 42
    Thanks, Jeff! Icon-twitter-22x22@jeffzugale
  3. The TV adaptation referred to James Holden's ship with a similar but distinct name. It is unknown whether that was intentional or a goof.
  4. 4.0 4.1 the tone used when the remark was made suggests it may actually have been just a form of denigration and not an actual PT boat